linux-imx

/*

 * Copyright (C) 2011 ST-Ericsson SA.

 * Copyright (C) 2009 Motorola, Inc.

 *

 * License Terms: GNU General Public License v2

 *

 * Simple driver for National Semiconductor LM3530 Backlight driver chip

 *

 * Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>

 * based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com>

 */

​

#include <linux/i2c.h>

#include <linux/leds.h>

#include <linux/slab.h>

#include <linux/platform_device.h>

#include <linux/input.h>

#include <linux/led-lm3530.h>

#include <linux/types.h>

#include <linux/regulator/consumer.h>

#include <linux/module.h>

​

#define LM3530_LED_DEV "lcd-backlight"

#define LM3530_NAME "lm3530-led"

​

#define LM3530_GEN_CONFIG       0x10

#define LM3530_ALS_CONFIG       0x20

#define LM3530_BRT_RAMP_RATE        0x30

#define LM3530_ALS_IMP_SELECT       0x41

#define LM3530_BRT_CTRL_REG     0xA0

#define LM3530_ALS_ZB0_REG      0x60

#define LM3530_ALS_ZB1_REG      0x61

#define LM3530_ALS_ZB2_REG      0x62

#define LM3530_ALS_ZB3_REG      0x63

#define LM3530_ALS_Z0T_REG      0x70

#define LM3530_ALS_Z1T_REG      0x71

#define LM3530_ALS_Z2T_REG      0x72

#define LM3530_ALS_Z3T_REG      0x73

#define LM3530_ALS_Z4T_REG      0x74

#define LM3530_REG_MAX          14

​

/* General Control Register */

#define LM3530_EN_I2C_SHIFT     (0)

#define LM3530_RAMP_LAW_SHIFT       (1)

#define LM3530_MAX_CURR_SHIFT       (2)

#define LM3530_EN_PWM_SHIFT     (5)

#define LM3530_PWM_POL_SHIFT        (6)

#define LM3530_EN_PWM_SIMPLE_SHIFT  (7)

​

#define LM3530_ENABLE_I2C       (1 << LM3530_EN_I2C_SHIFT)

#define LM3530_ENABLE_PWM       (1 << LM3530_EN_PWM_SHIFT)

#define LM3530_POL_LOW          (1 << LM3530_PWM_POL_SHIFT)

#define LM3530_ENABLE_PWM_SIMPLE    (1 << LM3530_EN_PWM_SIMPLE_SHIFT)

​

/* ALS Config Register Options */

#define LM3530_ALS_AVG_TIME_SHIFT   (0)

#define LM3530_EN_ALS_SHIFT     (3)

#define LM3530_ALS_SEL_SHIFT        (5)

​

#define LM3530_ENABLE_ALS       (3 << LM3530_EN_ALS_SHIFT)

​

/* Brightness Ramp Rate Register */

#define LM3530_BRT_RAMP_FALL_SHIFT  (0)

#define LM3530_BRT_RAMP_RISE_SHIFT  (3)

​

/* ALS Resistor Select */

#define LM3530_ALS1_IMP_SHIFT       (0)

#define LM3530_ALS2_IMP_SHIFT       (4)

​

/* Zone Boundary Register defaults */

#define LM3530_ALS_ZB_MAX       (4)

#define LM3530_ALS_WINDOW_mV        (1000)

#define LM3530_ALS_OFFSET_mV        (4)

​

/* Zone Target Register defaults */

#define LM3530_DEF_ZT_0         (0x7F)

#define LM3530_DEF_ZT_1         (0x66)

#define LM3530_DEF_ZT_2         (0x4C)

#define LM3530_DEF_ZT_3         (0x33)

#define LM3530_DEF_ZT_4         (0x19)

​

/* 7 bits are used for the brightness : LM3530_BRT_CTRL_REG */

#define MAX_BRIGHTNESS          (127)

​

struct lm3530_mode_map {

    const char *mode;

    enum lm3530_mode mode_val;

};

​

static struct lm3530_mode_map mode_map[] = {

    { "man", LM3530_BL_MODE_MANUAL },

    { "als", LM3530_BL_MODE_ALS },